package com.lbc.syn;

//  不安全的取钱
//  两个人去银行取钱，账户
public class UnsafeBank {
    public static void main(String[] args) {
        //  账户
        Account account = new Account(100, "夫妻共同财产");

        Drawing you = new Drawing(account, 50, "你");
        Drawing girlFriend = new Drawing(account, 100, "girlFriend");

        you.start();
        girlFriend.start();
    }
}

//  账户
class Account {
    int money;  //  余额
    String name;  //  卡名

    public Account(int money, String name) {
        this.money = money;
        this.name = name;
    }
}

//   银行
class Drawing extends Thread {
    Account account;  //  账户
    //  谁取了多少钱
    int drawingMoney;
    //  现在手里有多少钱
    int nowMoney;

    public Drawing(Account account,int drawingMoney, String name) {
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;
    }

    //  取钱
    //  synchronized 默认锁的是this,放这里没用，因为改的是账户而非银行里的钱
    @Override
    public void run() {

        //  同步块
        //  锁一个代码块，把要锁的this置为（）中的account
        //  锁的对象就是变化的量，需要增删改
        synchronized (account) {
            //  判断有没有钱
            if (account.money-drawingMoney<0) {
                System.out.println(Thread.currentThread().getName()+"钱不够，取不了");
                return;
            }

            //  sleep可以方法问题的发生性
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            //  卡内余额 = 金额 - 取的钱
            account.money = account.money - drawingMoney;
            //  手里的钱 = 手里的钱 + 取的钱
            nowMoney = nowMoney + drawingMoney;

            System.out.println(account.name+"余额为"+account.money);
            //  Thread.currentThread().getName() = this.getName()
            System.out.println(this.getName()+"手里的钱："+nowMoney);
        }
    }
}